Thank you @ukeboyska, yeah they directed me to that updated code as well and with a few tweaks I was able to get it working properly.. It was awhile ago now so I forget the issues that it had but all is working on this project now!
Hello @d0153, I did submit a support ticket without having the issue be resolved unfortunately.
Which is why I am reaching out to the public and hopefully find someone who has had success in implementing custom filtering to the filter bar on the new 6.x version of the plugin.
The 5.x version I have had success numerous times but unfortunately ability of creating custom filters on the filter bar is no longer possible based on what I can find and what I was told via the support ticket.
There isn’t a plugin that will use the servers mail system to do this?